Mainstage3 content/Jampacks do not appear in Garageband 10.2
I've purchased, downloaded and installed Mainstage3 (ALL content) to my Mac. But even though ALL content is installed it doesn't appear in Garageband - I've looked in the 'legacy' section and the Jampacks aren't there. I'm not sure that any of the new content is there in the garageband sound library (software instruments, loops, Jan packs). I know this has previously been a problem, but I cannot find out how to get the installed content into garageband. Can anyone please help? (If I had £2500 to spare I'd buy an i7 Mac with Logic Pro X but I don't so am stuck with limited/limiting garageband). Thanks...
iPad Air Wi-Fi + Cellular, iOS 10.3.1